Revert "Revert of Reland: Switch WindowedNotificationObserver to use base::RunLoop. (patchset #3 id…

extensions/test/extension_test_notification_observer.cc

Index: extensions/test/extension_test_notification_observer.cc
diff --git a/extensions/test/extension_test_notification_observer.cc b/extensions/test/extension_test_notification_observer.cc
index 3d2f23fa418d520841d62150be37c533f5bd4465..69c30d70169ddbf9aec66c10726f48475f1ff749 100644
--- a/extensions/test/extension_test_notification_observer.cc
+++ b/extensions/test/extension_test_notification_observer.cc
@@ -194,16 +194,15 @@ void ExtensionTestNotificationObserver::WaitForCondition(
     return;
   condition_ = condition;
 
-  scoped_refptr<content::MessageLoopRunner> runner(
-      new content::MessageLoopRunner);
-  quit_closure_ = runner->QuitClosure();
+  base::RunLoop run_loop;
+  quit_closure_ = run_loop.QuitClosure();
 
   std::unique_ptr<base::CallbackList<void()>::Subscription> subscription;
   if (notification_set) {
     subscription = notification_set->callback_list().Add(base::Bind(
         &ExtensionTestNotificationObserver::MaybeQuit, base::Unretained(this)));
   }
-  runner->Run();
+  run_loop.Run();
 
   condition_.Reset();
   quit_closure_.Reset();